CN112383070A - Control method, device and system for off-grid and grid-connected switching of microgrid - Google Patents
Control method, device and system for off-grid and grid-connected switching of microgrid Download PDFInfo
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- CN112383070A CN112383070A CN202011305234.9A CN202011305234A CN112383070A CN 112383070 A CN112383070 A CN 112383070A CN 202011305234 A CN202011305234 A CN 202011305234A CN 112383070 A CN112383070 A CN 112383070A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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Abstract
The application relates to a method, a device and a system for controlling off-grid and on-grid switching of a micro-grid, wherein the method for controlling off-grid and on-grid switching of the micro-grid comprises the steps of monitoring an off-grid and on-grid switching instruction in real time; when a grid-connected to off-grid switching instruction is received, controlling the energy storage converter to be used as a voltage source to output; when an off-grid switching to grid-connection instruction is received, current during off-grid switching and grid-connection is controlled to enable the power grid to be stable, and the energy storage converter is controlled to serve as a current source to output after the power grid is stable. The problem that the starting current of the energy storage converter is too large and cannot enter the grid connection in the grid disconnection and connection process can be avoided, the stability of a power grid is guaranteed, and the safety of an electric appliance is improved to a great extent.
Description
Technical Field
The application belongs to the technical field of micro-grids, and particularly relates to a method, a device and a system for controlling off-grid and on-grid switching of a micro-grid.
Background
The micro-grid is an important way for solving the problem that distributed power generation is seamlessly connected into a main grid, and the energy storage system is an indispensable unit for establishing the micro-grid, so that stable power is provided for loads, and the power utilization reliability is improved; the peak clipping and valley filling are realized, the power quality of the micro-grid is improved, and the problems of uncontrollable wind power and photoelectricity and high volatility in the micro-grid are solved. The off-grid and on-grid function of energy storage always occupies a significant position in the energy storage system. In the grid connection process, the stored energy can be used for charging the self to serve as a standby battery, the power consumption of the power grid can be reduced when the power grid transmits power, and the energy can be input into the power grid to obtain benefits. When the power grid is suddenly cut off, the energy storage system is connected to the grid and switched to be disconnected from the grid, the energy storage system instantly provides energy required by the load, and continuous uninterrupted power supply of the electric appliance is realized. During the off-grid process, the stored energy serves as a voltage source to supply power to the load. In the process of off-grid switching and grid connection, a load needs to be switched to a power grid, the power grid provides energy, and the mode is switched to a grid connection mode. In the related technology, in the process of off-grid switching and grid connection, after the fact that the mains supply of a power grid is connected is detected, all energy storage power is released immediately and is directly connected to the power grid, so that the current transformer is connected to an electric appliance with extremely high power instantly, instantaneous current is extremely high, the current transformer is damaged to a certain extent, even a power supply is unstable, and the safety of the electric appliance is influenced.
Disclosure of Invention
In order to overcome the problems that in the off-grid and grid-connected switching process, after the fact that mains supply of a power grid is connected is detected, all stored energy power is released immediately and is directly connected to the power grid, so that instantaneous current is extremely large, certain damage can be caused to a converter, even a power supply source is unstable, and the safety of an electric appliance is affected, the method, the device and the system for controlling off-grid and grid-connected switching of the micro-grid are provided.
In a first aspect, the present application provides a method for controlling off-grid and on-grid switching of a microgrid, including:
monitoring a grid disconnection and connection switching instruction in real time;
when a grid-connected to off-grid switching instruction is received, controlling the energy storage converter to be used as a voltage source to output;
when an off-grid switching to grid-connection instruction is received, current during off-grid switching and grid-connection is controlled to enable the power grid to be stable, and the energy storage converter is controlled to serve as a current source to output after the power grid is stable.
Further, the controlling the current when the grid is disconnected and connected to the grid so as to stabilize the grid includes:
when the off-grid switching-in and grid-connection are carried out, the current is limited by adding a current limiting device so as to inhibit the current from increasing.
Further, the current limiting device comprises a current limiting resistor.
Further, the controlling the current when the grid is disconnected and connected to the grid so as to stabilize the grid includes:
and after the off-grid switching-in and the grid connection are carried out, slowly reducing the current to zero within a preset delay time.
Further, after switching off the grid into the grid connection, slowly reducing the current to zero within a preset delay time, including:
acquiring output current when the off-grid switching-in and grid-connection are carried out;
and controlling the output current to be reduced to zero according to a preset rule within a preset delay time.
Further, the preset rule includes:
and sequentially reducing the current to 0 according to the reduced amplitude or reducing the current value according to a preset current curve so as to enable the current value to be 0.
Further, the preset delay time is 20 seconds.
Further, the method also comprises the following steps:
and not responding to an external instruction within the preset delay time.
Further, the controlling the current when the grid is disconnected and connected to the grid so as to stabilize the grid includes:
and carrying out load reduction treatment on the load connected into the power grid.
Further, the load shedding processing of the load connected to the power grid includes:
adjusting the input power of the access loads and/or reducing the number of access loads.
In a second aspect, the present application provides a control device for microgrid grid-off and grid-connected switching, including:
the monitoring module is used for monitoring a grid disconnection and connection switching instruction in real time;
the first control module is used for controlling the energy storage converter to be used as a voltage source to output when receiving a command of switching from grid connection to grid disconnection;
and the second control module is used for controlling the current during the off-grid switching and the grid-connection so as to stabilize the power grid when receiving the off-grid switching to grid-connection instruction, and controlling the energy storage converter to be used as a current source to output after the power grid is stabilized.
In a third aspect, the present application provides a control system for microgrid grid-off and grid-connected switching, including:
the control device and the energy storage converter for off-grid and on-grid switching of the microgrid according to the second aspect;
and the control device for switching the off-grid and on-grid of the microgrid is connected with the energy storage converter.
Further, the method also comprises the following steps: and the current limiting device is respectively connected with the control device for switching off and on the grid of the microgrid and the energy storage converter.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
according to the control method, device and system for off-grid and grid-connected switching of the microgrid provided by the embodiment of the invention, the control method for off-grid and grid-connected switching of the microgrid comprises the steps of monitoring an off-grid and grid-connected switching instruction in real time, controlling the energy storage converter to be used as a voltage source for outputting when the off-grid and grid-connected instruction is received, controlling the current during off-grid and grid-connected switching to stabilize the power grid when the off-grid and grid-connected instruction is received, controlling the energy storage converter to be used as a current source for outputting after the power grid is stabilized, avoiding the problem that the starting current of the energy storage converter is too large and cannot enter the grid-connected process in the off-grid and grid-connected process in the switching process.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a flowchart of a method for controlling off-grid and grid-connection switching of a microgrid according to an embodiment of the present application.
Fig. 2 is a flowchart of a method for controlling off-grid and grid-connection switching of a microgrid according to another embodiment of the present application.
Fig. 3 is a flowchart of a method for controlling off-grid and grid-connection switching of a microgrid according to another embodiment of the present application.
Fig. 4 is a flowchart of a method for controlling off-grid and grid-connection switching of a microgrid according to another embodiment of the present application.
Fig. 5 is a functional structure diagram of a control device for microgrid grid-off and grid-on switching according to an embodiment of the present application.
Fig. 6 is a functional structure diagram of a control system for microgrid grid-off and grid-on switching according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a flowchart of a method for controlling microgrid grid-off and grid-connection switching according to an embodiment of the present application, and as shown in fig. 1, the method for controlling microgrid grid-off and grid-connection switching includes:
s11: monitoring a grid disconnection and connection switching instruction in real time;
s12: when a grid-connected to off-grid switching instruction is received, controlling the energy storage converter to be used as a voltage source to output;
s13: when an off-grid switching to grid-connection instruction is received, current during off-grid switching and grid-connection is controlled to enable the power grid to be stable, and the energy storage converter is controlled to serve as a current source to output after the power grid is stable.
During the off-grid process, the stored energy serves as a voltage source to supply power to the load. In the process of off-grid switching and grid connection, a load needs to be switched to a power grid, the power grid provides energy, and the mode is switched to a grid connection mode. In the related technology, in the process of off-grid switching and grid connection, after the fact that the mains supply of a power grid is connected is detected, all energy storage power is released immediately and is directly connected to the power grid, so that the current transformer is connected to an electric appliance with extremely high power instantly, instantaneous current is extremely high, the current transformer is damaged to a certain extent, even a power supply is unstable, and the safety of the electric appliance is influenced.
In the embodiment, the off-grid and grid-connected switching instruction is monitored in real time, the energy storage converter is controlled to be used as a voltage source to output when the off-grid and grid-connected instruction is received, the current when the off-grid and grid-connected is switched is controlled to stabilize the power grid when the off-grid and grid-connected instruction is received, the energy storage converter is controlled to be used as a current source to output after the power grid is stabilized, the problem that the starting current of the energy storage converter is too large and cannot enter the grid-connected mode in the off-grid and grid-connected process can be avoided in the switching process, the stability of the power grid is guaranteed, and the.
An embodiment of the present application provides another method for controlling grid disconnection and connection switching of a microgrid, as shown in a flowchart in fig. 2, the method for controlling grid disconnection and connection switching of the microgrid includes:
s21: monitoring a grid disconnection and connection switching instruction in real time;
s22: when a grid-connected to off-grid switching instruction is received, controlling the energy storage converter to be used as a voltage source to output;
when the grid is switched in and out of the grid, the energy storage converter serves as a standby battery to be used emergently due to the fact that no commercial power is connected, and the irreparable loss caused by power failure of an electric appliance is prevented. The working state of the energy storage converter needs to be switched in time, and the energy storage converter is equivalent to a voltage source to output at the moment, bear the power of an electric appliance and achieve the purpose of uninterrupted power supply.
S23: when an off-grid switching to grid-connection instruction is received, limiting the current by adding a current limiting device so as to inhibit the current from increasing;
in some embodiments, the current limiting device includes, but is not limited to, a current limiting resistor.
S24: and after the power grid is stabilized, controlling the energy storage converter to be used as a current source for outputting.
The current limiting device can prevent overlarge current caused by convection current when the grid-connected switch is disconnected. And then, a current-limiting resistor is connected when the grid-connected switching is carried out, so that the current can be prevented from being overlarge, the current-limiting resistor is disconnected after the switching is finished, and the loss is reduced, thereby solving the problem that the starting current of the energy storage converter is overlarge and the safety of an electric appliance is influenced by the hardware design.
In the embodiment, the grid disconnection and connection switching instruction is monitored in real time, and the grid disconnection and connection is carried out according to the switching logic after the switching instruction is received, so that the power fluctuation during switching is reduced, the stability of a power grid is maintained, and the condition that an electric appliance is not powered off is ensured.
Fig. 3 is a flowchart of a method for controlling switching between grid disconnection and connection of a microgrid according to an embodiment of the present application, and as shown in fig. 3, the method for controlling switching between grid disconnection and connection of a microgrid includes:
s31: when an off-grid switching-to-grid instruction is received, acquiring output current when the off-grid switching-in and the grid-connection are performed;
s32: controlling the output current to be reduced to zero according to a preset rule within a preset delay time;
in some embodiments, the rules are preset, including: and sequentially reducing the current to 0 according to the reduced amplitude or reducing the current value according to a preset current curve so as to enable the current value to be 0.
The preset delay time is, for example, 20 seconds.
S33: and after the power grid is stabilized, controlling the energy storage converter to be used as a current source for outputting.
And waiting for an output instruction, and outputting according to the output instruction after the power grid is stable.
As shown in fig. 4, when switching from off-grid to on-grid, the output current when off-grid is first detected is: and I, switching the mode to enter grid connection, wherein the energy storage converter is equivalent to a current source, and charging and discharging operations can be carried out only according to an upper scheduling instruction (for example, an instruction sent by a touch screen, an upper computer and the like). If the situation that the grid-off mode is switched to the grid-connected mode is monitored, the default command is that the current I is used for discharging, the current slowly decreases to zero in 20S, when the I is 0, the energy storage converter transfers all power to the power grid side, and as long as an upper-layer scheduling output command (including a charging command, a discharging command, a charging current regulating command or a discharging current regulating command) is waited, the power is normally output according to the upper-layer scheduling command.
In some embodiments, further comprising:
and no response to the external instruction within the preset delay time. For example, the upper layer scheduling command is not received within 20 seconds of switching from the off-grid to the on-grid, and the command is received only when the current I becomes 0 after 20 seconds.
In some embodiments, the controlling the current when the grid is disconnected and connected from the grid to stabilize the grid further includes:
and carrying out load reduction treatment on the load connected into the power grid.
For example, adjusting the input power of the access loads, and/or reducing the number of access loads.
In the embodiment, when the off-grid switching and grid connection are carried out, the energy storage is switched from the voltage source to the current source, the output current is slowly reduced to zero by controlling the output current, the energy storage power is soft released and is handed over to the power grid, and the safety of the electric appliance is improved.
Fig. 5 is a functional structure diagram of a control device for microgrid grid-off and grid-on switching according to an embodiment of the present application, and as shown in fig. 5, the control device for microgrid grid-off and grid-on switching includes:
the monitoring module 51 is used for monitoring a grid disconnection and connection switching instruction in real time;
the first control module 52 is configured to control the energy storage converter to output as a voltage source when receiving a command for switching from grid connection to grid disconnection;
and the second control module 53 is configured to control the current during the off-grid switching and the grid-connection when receiving the off-grid switching to grid-connection instruction, so as to stabilize the power grid, and control the energy storage converter to output as a current source after the power grid is stabilized.
In the embodiment, the off-grid and grid-connected switching instruction is monitored in real time through the monitoring module, the first control module controls the energy storage converter to be output as a voltage source when receiving the off-grid and grid-connected instruction, the second control module controls the current when the off-grid and grid-connected are switched to be stable when receiving the off-grid and grid-connected instruction, the energy storage converter is controlled to be output as a current source after the power grid is stable, the problem that the starting current of the energy storage converter is too large and cannot enter the grid-connected process in the off-grid and grid-connected process can be avoided, the stability of the power grid is ensured, and the safety of an electric appliance is improved to.
Fig. 6 is a functional structure diagram of a control system for switching off and on of a microgrid, which is provided in an embodiment of the present application, and as shown in fig. 6, the control system for switching off and on of a microgrid includes:
the control device 61 and the energy storage converter 62 for off-grid and on-grid switching of the microgrid as described in the above embodiments;
the control device 61 for switching off and on the grid of the microgrid is connected with the energy storage converter 62.
The current output of the energy storage converter 62 is controllable, and the energy storage converter is controlled to discharge when switching from off-grid to grid-connection, and the current is slowly reduced to zero within a preset delay time.
Or a current limiting device 63 is added, and the current limiting device 63 is respectively connected with a control device 61 for switching off and on the grid of the microgrid and an energy storage converter 62.
In the embodiment, the control device for switching the off-grid and the grid-connected of the microgrid is connected with the energy storage converter, the current during the off-grid and grid-connected switching is controlled to stabilize the power grid, and the energy storage converter is controlled to be output as a current source after the power grid is stabilized, so that the problem that the starting current of the energy storage converter is too large and cannot enter the grid-connected state in the off-grid and grid-connected switching process is avoided, the stability of the power grid is ensured, and the safety of an electric appliance is improved to a.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
It should be noted that the present invention is not limited to the above-mentioned preferred embodiments, and those skilled in the art can obtain other products in various forms without departing from the spirit of the present invention, but any changes in shape or structure can be made within the scope of the present invention with the same or similar technical solutions as those of the present invention.
Claims (13)
1. A control method for off-grid and on-grid switching of a microgrid is characterized by comprising the following steps:
monitoring a grid disconnection and connection switching instruction in real time;
when a grid-connected to off-grid switching instruction is received, controlling the energy storage converter to be used as a voltage source to output;
when an off-grid switching to grid-connection instruction is received, current during off-grid switching and grid-connection is controlled to enable the power grid to be stable, and the energy storage converter is controlled to serve as a current source to output after the power grid is stable.
2. The method for controlling off-grid and on-grid switching of the microgrid according to claim 1, wherein the controlling of the current when the microgrid is off-grid and on-grid to stabilize the microgrid comprises:
when the off-grid switching-in and grid-connection are carried out, the current is limited by adding a current limiting device so as to inhibit the current from increasing.
3. The method for controlling microgrid grid-disconnection and grid-connection switching according to claim 2, characterized in that the current limiting device comprises a current limiting resistor.
4. The method for controlling off-grid and on-grid switching of the microgrid according to claim 1, wherein the controlling of the current when the microgrid is off-grid and on-grid to stabilize the microgrid comprises:
and after the off-grid switching-in and the grid connection are carried out, slowly reducing the current to zero within a preset delay time.
5. The method for controlling the off-grid and on-grid switching of the microgrid according to claim 4, wherein after the off-grid switching is carried out on the grid, the current is slowly reduced to zero within a preset delay time, and the method comprises the following steps:
acquiring output current when the off-grid switching-in and grid-connection are carried out;
and controlling the output current to be reduced to zero according to a preset rule within a preset delay time.
6. The method for controlling microgrid grid-off and grid-connection switching according to claim 5, wherein the preset rule comprises:
and sequentially reducing the current to 0 according to the reduced amplitude or reducing the current value according to a preset current curve so as to enable the current value to be 0.
7. The method for controlling off-grid and on-grid switching of the microgrid according to claim 5, characterized in that the preset delay time is 20 seconds.
8. The method for controlling the off-grid and on-grid switching of the microgrid according to any of claims 5 or 7, further comprising:
and not responding to an external instruction within the preset delay time.
9. The method for controlling off-grid and on-grid switching of the microgrid according to claim 1, wherein the controlling of the current when the microgrid is off-grid and on-grid to stabilize the microgrid comprises:
and carrying out load reduction treatment on the load connected into the power grid.
10. The method for controlling the off-grid and on-grid switching of the microgrid according to claim 9, wherein the load reduction processing of the load connected to the microgrid comprises:
adjusting the input power of the access loads and/or reducing the number of access loads.
11. A control device for off-grid and on-grid switching of a microgrid is characterized by comprising:
the monitoring module is used for monitoring a grid disconnection and connection switching instruction in real time;
the first control module is used for controlling the energy storage converter to be used as a voltage source to output when receiving a command of switching from grid connection to grid disconnection;
and the second control module is used for controlling the current during the off-grid switching and the grid-connection so as to stabilize the power grid when receiving the off-grid switching to grid-connection instruction, and controlling the energy storage converter to be used as a current source to output after the power grid is stabilized.
12. A control system for off-grid and on-grid switching of a microgrid is characterized by comprising: the microgrid grid-off and grid-connection switching control device and energy storage converter of claim 11;
and the control device for switching the off-grid and on-grid of the microgrid is connected with the energy storage converter.
13. The microgrid grid-off and grid-connection switching control system of claim 12, further comprising: and the current limiting device is respectively connected with the control device for switching off and on the grid of the microgrid and the energy storage converter.
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| CN202011305234.9A CN112383070A (en) | 2020-11-19 | 2020-11-19 | Control method, device and system for off-grid and grid-connected switching of microgrid |
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| CN202011305234.9A CN112383070A (en) | 2020-11-19 | 2020-11-19 | Control method, device and system for off-grid and grid-connected switching of microgrid |
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| CN111342496A (en) * | 2020-04-16 | 2020-06-26 | 阳光电源股份有限公司 | Micro-grid switching device and switching control method |
| CN111564896A (en) * | 2020-05-11 | 2020-08-21 | 国家电网有限公司 | Smooth switching and flexible exiting method and device for voltage sag treatment device |
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| CN103928946A (en) * | 2014-05-07 | 2014-07-16 | 湖南大学 | Smooth switching control method for three-phase dual-mode inverter |
| CN104362665A (en) * | 2014-09-28 | 2015-02-18 | 北京索英电气技术有限公司 | Microgrid on-grid to off-grid switching control system and control method thereof |
| CN111342496A (en) * | 2020-04-16 | 2020-06-26 | 阳光电源股份有限公司 | Micro-grid switching device and switching control method |
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Application publication date: 20210219 |